Two new records of the fern genus Lindsaea Dryand. ex Sm. (Lindsaeaceae) from Panama

. We present the first records of Lindsaea leprieurii Hook. and Lindsaea angustipinna A.Rojas & Tejero from Panama. Images, taxonomic comments, conservation assessments, and geographic notes are provided.

Lindsaea is a pantropical genus characterized by having short petioles, abaxially keeled rachises, broad rachis sulcation, twice-ordered laminar venation, and presence of sori towards the margin of the segments, as well as having indusia usually opening towards the margin (Kramer 1957;Lehtonen et al. 2010). Lindsaea currently comprises approximately 150 species which are distributed in 13 clades (only four of these clades are exclusively Neotropical) (Lehtonen et al. 2010). At present, the Neotropical region comprises more than 50 species, of which 17 occur in Mesoamerica (Rojas-Alvarado and Tejero-Díez 2017) and 13 in Panama (Correa et al. 2004, with additions by Rojas-Alvarado and Tejero-Díez 2017).
During curation and revision of the fern collections in the PMA Herbarium, we identified two species of the genus Lindsaea, L. leprieurii Hook. and L. angustipinna A. Rojas and Tejero, which represent new records for the flora of Panama. With these additions, Panama now has 15 species of Lindsaea.

Methods
We confirmed the studied PMA herbarium specimens by comparing them with type material housed at B, CR, K, MO, and USJ (acronyms according to Thiers 2022). In addition, type specimens were examined online by consulting the JSTOR Global Plants database (JSTOR 2022). Morphological information was obtained from Kramer (1957) and Rojas-Alvarado and Tejero-Díez (2017), with modifications based on the studied herbarium specimens. Distribution data were taken from GBIF (2022) and Tropicos (2022).

Discussion
Previous studies on Lindsaea (Rojas-Alvarado and Tejero-Díez 2017) stated that L. angustipinna occurred only in Nicaragua and Costa Rica at elevations between 900 and 1350 m. The specimen from the Province of Chiriquí was collected at a moderate elevation (1200 m) but plants from Coiba Island were collected from sea level to 416 m elevation at most. The Coiba Island specimens are unusual in that they are smaller overall and have notably smaller blades. Lindsaea angustipinna resembles to L. lancea (L.) Bedd. Both species have entire or repand acroscopic margins, continuous sori (only present along acroscopic side of segments), triangular to rectangular or similar segments that are (in longer segments) twice as long as wide, weakly reduced distal segments (at least 75 % the size of proximal segments), and subconform apical segments (0.8-2.0 cm broad at base). Lindsaea angustipinna differs from L. lancea in having stipes with at least their lower half atropurpureous (vs. completely stramineous), 1-pinnate (vs. 2-pinnate) blades, and segments 2.5-3.5× longer than wide (vs. 1.8-2.5×). Although the geographic distribution of L. angustipinna overlaps with that of L. lancea (known from Mexico, Mesoamerica, Antilles, Colombia, Ecuador, Peru, Bolivia, Venezuela, Trinidad, Suriname, Brazil, and Paraguay),  no hybrid specimens with intermediate morphological characteristics have been collected, which suggests that these species are reproductively separate.
Lindsaea leprieurii was previously reported from Costa Rica and northern South America (Rojas-Alvarado and Tejero-Díez 2017), which suggests that its presence in Panama was to be expected. The only representative specimen of this species in Panama (Mendieta 723 PMA) was previously identified as L. falcata Dryand., a species that currently does not occur in the Central American region (Rojas-Alvarado and Tejero-Díez 2017).